300-510 · Question #1
For which reason can two devices fail to establish an OSPF neighbor relationship?
The correct answer is B. The two devices have different network types. OSPF neighbors must have matching network types to form an adjacency. If one router is configured as 'broadcast' and the other as 'point-to-point' on the same link, they will not form a neighbor relationship because their hello/dead timer expectations and DR/BDR election…
Question
For which reason can two devices fail to establish an OSPF neighbor relationship?
Options
- AThe two devices have different process IDs
- BThe two devices have different network types
- CThe two devices have different router IDs
- DThe two devices have the same area ID
How the community answered
(40 responses)- A5% (2)
- B90% (36)
- C3% (1)
- D3% (1)
Explanation
OSPF neighbors must have matching network types to form an adjacency. If one router is configured as 'broadcast' and the other as 'point-to-point' on the same link, they will not form a neighbor relationship because their hello/dead timer expectations and DR/BDR election behavior differ. OSPF process IDs (A) are locally significant and do not need to match. Router IDs (C) must be unique but do not need to match. Sharing the same area ID (D) is actually a requirement for adjacency, not a reason for failure.
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